linux-kernel - Re: [Bug Report] Linux v6.15-rc7 boot failure on Xen-4.17

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Message-ID: <081152ba-79b5-477e-8248-02bf289ff9ce@citrix.com>
Date: Tue, 27 May 2025 20:29:03 +0100
From: Andrew Cooper <andrew.cooper3@...rix.com>
To: Xin Li <xin@...or.com>, Groß Jürgen <jgross@...e.com>
Cc: Gupta Pawan <pawan.kumar.gupta@...ux.intel.com>,
 linux-kernel@...r.kernel.org, x86@...nel.org,
 Zijlstra Peter <peterz@...radead.org>,
 Hansen Dave <dave.hansen@...ux.intel.com>, alexandre.chartre@...cle.com,
 Zhang Tao1 <tao1.zhang@...el.com>
Subject: Re: [Bug Report] Linux v6.15-rc7 boot failure on Xen-4.17

On 27/05/2025 8:21 pm, Xin Li wrote:
>> On May 27, 2025, at 11:36 AM, Jürgen Groß <jgross@...e.com> wrote:
>>
>> On 27.05.25 19:54, Xin Li wrote:
>>> On 5/27/2025 10:46 AM, Pawan Gupta wrote:
>>>>> Attached is the serial console log and my kernel config.
>>>> Serial logs aren't telling much. I do not have a Xen setup to test, without
>>>> Xen the config that you provided is booting a KVM guest just fine.
>>> Yeah, as I replied to Juergen, the same kernel binary boots fine as
>>> "native".
>>> Unfortunately when booting as dom0 on Xen, it keeps rebooting w/o
>>> helpful log.
>> What about booting Xen on bare metal, i.e. no KVM being involved?
> The same exact problem happens on Intel Simics.  And I got to see it’s a NX page fault in dom0 kernel during apply alternatives.

In which case it's likely that there's an opencoded PTE update, rather
than using the hooks (which are suitably paravirt'd).

> It takes a while for me to set it up on bare metal so it won’t happen so soon.
>
> A more serious question in my mind right now is that who are acutely testing latest vanilla Linux on xen?

Only upstream Xen, and we're looking to try and change this.

~Andrew